from tkinter import*

print ("Введите начальную координату X:")
x = int(input())
print ("Введите начальную координату Y:")
y = int(input())
print ("Введите коэффицент увеличения N:")
n = int(input())

coords = [0,0, 10,0, 10,10, 20,10, 20,20, 10,20, 10,30, 0,30]

if n==0 and x>=0 and y>=0 and x<=500 and y<=500:
    pass
else:
    if n>0 and x>=0 and y>=0 and 20*n+x<=500 and 20*n+y<=500:
        pass
    else:
        if n<0 and 20*n+x>=0 and 20*n+y>=0 and x<=500 and y<=500:
            pass
        else:
            print ("размер фигуры превышает максимальный размер поля")
            exit()

root = Tk()
root.title ("ИТ марафон")
root.geometry ("500x500")

canvas = Canvas(bg="white", width=500, height=500)
canvas.pack(anchor=CENTER, expand=1)

canvas.create_polygon(coords[0] *n+x, coords[1] *n+y,
                      coords[2] *n+x, coords[3] *n+y,
                      coords[4] *n+x, coords[5] *n+y,
                      coords[6] *n+x, coords[7] *n+y,
                      coords[8] *n+x, coords[9] *n+y,
                      coords[10] *n+x, coords[11] *n+y,
                      coords[12] *n+x, coords[13] *n+y,
                      coords[14] *n+x, coords[15] *n+y,)

root.mainloop()
